How a Federal Pension Changes Tax and Investment Planning

A federal pension and Social Security together provide a large, guaranteed income for as long as you live. That means a lot of security, but also a lot of taxable income in retirement.

For employees with a full career under the Federal Employees Retirement System (FERS), that guaranteed, taxable income changes how to approach the Thrift Savings Plan (TSP), the federal version of a 401(k).

The years right after retirement, before Social Security and required minimum distributions begin, are often an ideal time for Roth conversions, while your income and tax bracket are lower. That works less well for feds with a full pension, because the pension alone already fills much of the low brackets. For them, the Roth decision matters most while they're still contributing.

The pension and Social Security can also cover much of a retired fed's spending, so the TSP and other savings only have to fund the rest. That usually means the TSP can hold more stock than a standard allocation for someone their age.

Two Pensions, Higher Tax Brackets

Take a hypothetical Bethesda couple who are both 50 and both GS-15s at the Washington-area pay cap. Suppose they both work to 62, each with 30 years of service. Retiring at 62 with at least 20 years earns a higher FERS multiplier, 1.1 percent instead of 1 percent. Their two pensions would come to about $130,000 a year in today's dollars.

At 70, when many households like theirs claim Social Security, they would add two benefits worth roughly $100,000 a year combined, and at their income, 85 percent of that would be taxable.

So once Social Security starts, the couple would already be in the 22 percent federal bracket under today's rules, without taking a dollar from their TSP. Even before Social Security, their pensions alone would bring them close to the top of the 12 percent bracket, so most TSP withdrawals or Roth conversions in those years would be taxed at 22 percent.

Then there's the TSP itself. Two long careers can produce a seven-figure traditional balance, and even with withdrawals before Social Security, it would likely keep growing until required minimum distributions begin at 75, the starting age for anyone born in 1960 or later. When they do, they would push the couple into the 24 percent bracket.

Clients with large traditional balances often worry about a future tax bomb, and the usual strategy is to convert some of that money to Roth in the years right after retiring, while income is low. For this couple, income won't be low. Their pensions would put most conversions in the 22 percent bracket, not the 10 or 12 percent bracket the strategy usually counts on. Roth conversions can still make sense, and the TSP now allows them without moving money to an IRA first, but they're a smaller opportunity than many people expect. Their working years are also a valuable chance to build Roth savings, while they're still contributing.

Why Roth Contributions Can Make More Sense With a Large Pension

Traditional, pretax retirement contributions pay off when you withdraw the money later at a lower tax rate than the one you save at today. However, a full federal pension makes it less likely you'll be in a lower bracket in retirement. That's why I approach the Roth question differently with clients who have substantial pensions. On two salaries at the federal pay cap, the couple is in the 24 percent bracket today, about the same rate they would pay on TSP withdrawals in retirement.

Meanwhile, two other factors may favor Roth. Eventually one spouse is usually left filing as single, often on most of the couple's former income, with tax brackets roughly half as wide. And whatever traditional balance remains goes to children who may be in their own peak earning years, paying higher rates than their parents did.

Leaning toward Roth for their own contributions won't leave them short on pretax savings. Employer contributions still go in as traditional, and the pretax balance they've already built will keep growing. With fewer cheap conversion years ahead, it makes sense not to count on conversions alone.

None of this is a rule for every fed. A household with a smaller pension may still have room in the low brackets in retirement, and the extra take-home pay from traditional contributions may matter more today.

The same thinking applies to other taxable income you expect in retirement, such as rental income, consulting, or an inherited traditional IRA. Any of these raises the tax rate your traditional savings will face later, and strengthens the case for Roth now. Projecting that rate year by year is a big part of the tax planning I do for federal clients.

Why Feds Can Afford More Market Risk

The pension also changes how to invest the TSP, because the pension and Social Security work a lot like bonds. They pay a steady amount, largely keep pace with inflation, and are backed by the federal government. So a household with a full pension already has much of what bonds are supposed to provide, and its TSP doesn't need as many.

A pension and Social Security also leave less spending for the TSP to cover, so withdrawals can be smaller. With smaller withdrawals, a bad market is less likely to force a retiree to sell stocks while prices are down.

Unlike many early retirees, who have to pay for health insurance out of savings until Medicare starts at 65, federal retirees can usually keep FEHB, with the government still paying its share of the premium, as long as they've been enrolled for the five years before retiring. That leaves even fewer expenses for the TSP to cover.

That's why I'm comfortable with federal clients holding more stock in the TSP than a generic allocation for their age would suggest. A target-date fund doesn't know you have a pension, so it may shift toward bonds faster than a pensioned fed needs to.

The analogy has limits. You can't sell a pension, rebalance it, or tap it in an emergency. A pension lets you take more risk, but you still need an allocation you're comfortable holding through a market drop.

Even so, the years before Social Security deserve the most care. TSP withdrawals are typically largest then, especially for feds who wait until 70 to claim it, and a market drop early in retirement does the most damage. It's worth keeping a cushion of stable assets for those years and investing the rest for the long run. Timing withdrawals in those years is one of the central retirement planning questions for federal households.

Start Planning Around Your Pension Early

A FERS pension is easy to think of as a monthly check that arrives someday. But it shapes decisions you make long before then. Choices about Roth versus traditional contributions and how much stock to hold in the TSP compound over a career, so the earlier you factor in the pension, the more those choices can do.

If you're a federal employee and want to see how this applies to your own pension and TSP, you can schedule an introductory call.

Frequently Asked Questions

Does a FERS pension reduce my Social Security benefits?

Generally, no. Regular FERS service is covered by Social Security, so a pension earned through that service never triggered the Windfall Elimination Provision or the Government Pension Offset, the rules that cut benefits for people with pensions from jobs outside Social Security. The Social Security Fairness Act, signed in January 2025, repealed both rules, which mainly helped CSRS retirees and some who transferred from CSRS to FERS. For most FERS employees, the pension and Social Security simply stack. The real interaction is tax: the pension is a large part of why up to 85 percent of your benefits can be taxed.

Is my FERS pension taxable?

Mostly. Your FERS annuity is taxed as ordinary income at the federal level, except for a small portion that represents a return of your own after-tax retirement contributions. OPM reports the taxable amount on your annual 1099-R. In Maryland, Social Security is exempt from state tax, and residents 65 and older can exclude part of their pension income. That exclusion is capped, though, at $40,600 for 2026, and it shrinks dollar for dollar with the Social Security you receive, so many dual-pension households get little from it.

How much is my FERS pension worth?

A rough gauge is what it would cost to buy the same income yourself. Producing about $65,000 a year from age 62, rising with inflation, for a typical lifespan would take more than a million dollars in inflation-protected Treasury bonds. The exact figure depends on interest rates, your retirement age, whether you elect a survivor benefit, and how long you live. You can't withdraw it like an account, but it can be a major source of guaranteed retirement income.

Should I count my FERS pension as part of my bond allocation?

For thinking about risk, yes. You don't need to put a dollar value on it. The practical question is how much of your spending the pension and Social Security will cover. The larger that share, the less the TSP needs bonds for stability, and the more it can lean toward stocks. Treat it as one input rather than a substitute for bonds, though: you still need cash for emergencies and an allocation you can live with in a bad market.